JP2001327838A - Exhaust cleaning device for diesel engine - Google Patents
Exhaust cleaning device for diesel engineInfo
- Publication number
- JP2001327838A JP2001327838A JP2000148019A JP2000148019A JP2001327838A JP 2001327838 A JP2001327838 A JP 2001327838A JP 2000148019 A JP2000148019 A JP 2000148019A JP 2000148019 A JP2000148019 A JP 2000148019A JP 2001327838 A JP2001327838 A JP 2001327838A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- monolith
- exhaust gas
- diesel engine
- hydrocarbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Hydrogen, Water And Hydrids (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ディーゼルエンジ
ンの排気浄化装置において、特に、窒素酸化物（以下
「ＮＯｘ」という）の排出量を低減する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing the emission of nitrogen oxides (hereinafter referred to as "NOx") in an exhaust emission control device for a diesel engine.
【０００２】[0002]
【従来の技術】従来から、ディーゼルエンジンの排気を
浄化することを目的として、排気通路に介装されたモノ
リスタイプの触媒により、排気中のＮＯｘを還元浄化す
る排気浄化装置が公知である。この場合、ＮＯｘを還元
するための還元剤として、排気中の炭化水素（以下「Ｈ
Ｃ」という）が用いられているが、その量が浄化するＮ
Ｏｘに比べて少ないので、触媒上流側に燃料等のＨＣを
添加するようにした技術が案出されている。2. Description of the Related Art Conventionally, there has been known an exhaust gas purifying apparatus for reducing and purifying NOx in exhaust gas by a monolith type catalyst provided in an exhaust passage for purifying exhaust gas of a diesel engine. In this case, as a reducing agent for reducing NOx, hydrocarbon (hereinafter referred to as “H
C ”) is used, but the amount of N
Since it is smaller than Ox, a technique for adding HC such as fuel to the upstream side of the catalyst has been proposed.
【０００３】このような排気浄化装置として、例えば、
Catalysis Surveys from Japan 3(1999) P.139-146に開
示されているような、いわゆるＩＡＲ（Intermediate A
ddition of Reductant）方法を採用したものがある。即
ち、排気通路に２つのモノリスを直列に介装し、上流側
のモノリスに貴金属担持系触媒を塗布する一方、下流側
のモノリスに金属担持ゼオライト触媒を塗布し、両触媒
間で還元剤としてのＨＣが供給されるように構成する。
そして、上流側のモノリスに塗布された触媒により、一
酸化窒素（ＮＯ）を二酸化窒素（ＮＯ2）に転化した
後、下流側のモノリスに塗布された触媒により、転化さ
れた二酸化窒素を窒素（Ｎ2），二酸化炭素（ＣＯ2）及
び水（Ｈ2Ｏ）に還元浄化することで、排気中のＮＯｘ
が低減される。As such an exhaust gas purifying device, for example,
A so-called IAR (Intermediate A) as disclosed in Catalysis Surveys from Japan 3 (1999) P.139-146.
ddition of Reductant) method. That is, two monoliths are interposed in series in the exhaust passage, and a noble metal-supported catalyst is applied to the upstream monolith, while a metal-supported zeolite catalyst is applied to the downstream monolith, and a reducing agent as a reducing agent is provided between the two catalysts. It is configured so that HC is supplied.
After the catalyst applied to the upstream monolith converts nitrogen monoxide (NO) to nitrogen dioxide (NO 2 ), the catalyst applied to the downstream monolith converts the converted nitrogen dioxide into nitrogen ( N 2 ), carbon dioxide (CO 2 ) and water (H 2 O).
Is reduced.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
ＩＡＲ方法では、触媒のＮＯｘ還元性能がいまだ不十分
であるため、触媒の活性化が低い低温状態においては、
ＮＯｘ低減率が十分とは言えず、さらなるＮＯｘの低減
による排気浄化が求められていた。However, in the conventional IAR method, since the NOx reduction performance of the catalyst is still insufficient, in a low temperature state where the activation of the catalyst is low,
The NOx reduction rate cannot be said to be sufficient, and exhaust purification by further reduction of NOx has been demanded.
【０００５】そこで、本発明は以上のような従来の問題
点に鑑み、水蒸気改質反応により生成された水素を用い
て、さらなるＮＯｘの排出量の低減を実現したディーゼ
ルエンジンの排気浄化装置を提供することを目的とす
る。In view of the above problems, the present invention provides a diesel engine exhaust gas purifying apparatus that further reduces NOx emissions by using hydrogen produced by a steam reforming reaction. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】このため、請求項１記載
の発明では、排気通路に介装されたモノリスと、前記モ
ノリスに塗布された第１及び第２の触媒と、当該モノリ
スの上流側に炭化水素を添加する炭化水素添加手段と、
を含んで構成されるディーゼルエンジンの排気浄化装置
であって、前記第１の触媒は、前記炭化水素添加手段に
より添加された炭化水素を還元剤として、次式のような
水蒸気改質反応を起こさせる一方、 ＣmＨn＋mＨ2Ｏ→mＣＯ＋（m＋n／2）Ｈ2 前記第２の触媒は、排気中の窒素酸化物に対して、前記
第１の触媒により生成された水素及び前記炭化水素添加
手段により添加された炭化水素を、夫々次式のように反
応させる ＮＯx＋Ｈ2→Ｎ2＋Ｈ2Ｏ ＮＯx＋ＣmＨn→Ｎ2＋ＣＯ2＋Ｈ2Ｏ ことを特徴とする。Therefore, according to the first aspect of the present invention, there is provided a monolith disposed in an exhaust passage, first and second catalysts applied to the monolith, and an upstream side of the monolith. Hydrocarbon addition means for adding hydrocarbons to
Wherein the first catalyst causes a steam reforming reaction represented by the following equation by using the hydrocarbon added by the hydrocarbon adding means as a reducing agent. while to, C m H n + mH 2 O → mCO + (m + n / 2) H 2 wherein the second catalyst is to the nitrogen oxides in the exhaust, said first hydrogen and the hydrocarbons produced by the catalytic The hydrocarbons added by the adding means are reacted as follows: NO x + H 2 → N 2 + H 2 O NO x + C m H n → N 2 + CO 2 + H 2 O
【０００７】かかる構成によれば、ディーゼルエンジン
から排出された排気は、排気通路を通って排気浄化装置
に導入されると、炭化水素添加手段により添加された炭
化水素と混合し、排気と炭化水素とからなる混合気が形
成される。この混合気がモノリスを通過する際、第１の
触媒と接触すると水蒸気改質反応が起こり、水素が生成
される。そして、混合気及び水素が第２の触媒と接触す
ると、排気に含まれる窒素酸化物が水素及び炭化水素と
夫々反応し、無害な窒素，二酸化炭素及び水（水蒸気）
となる。With this configuration, when the exhaust gas discharged from the diesel engine is introduced into the exhaust gas purification device through the exhaust passage, the exhaust gas mixes with the hydrocarbon added by the hydrocarbon adding means, and the exhaust gas and the hydrocarbon are mixed. Is formed. When the air-fuel mixture passes through the monolith and comes into contact with the first catalyst, a steam reforming reaction occurs to generate hydrogen. Then, when the mixture and the hydrogen come into contact with the second catalyst, the nitrogen oxides contained in the exhaust gas react with the hydrogen and the hydrocarbon, respectively, resulting in harmless nitrogen, carbon dioxide and water (steam).
Becomes
【０００８】請求項２記載の発明では、前記第１の触媒
は、ロジウム担持ジルコニア触媒であることを特徴とす
る。かかる構成によれば、第１の触媒としてロジウム担
持ジルコニア触媒を用いることにより、水蒸気改質反応
が効果的に行なわれる。[0008] The invention according to claim 2 is characterized in that the first catalyst is a rhodium-supported zirconia catalyst. According to this configuration, the steam reforming reaction is effectively performed by using a rhodium-supported zirconia catalyst as the first catalyst.
【０００９】請求項３記載の発明では、前記第２の触媒
は、白金担持ゼオライト触媒又は銀担持アルミナ触媒で
あることを特徴とする。かかる構成によれば、第２の触
媒として白金担持ゼオライト触媒又は銀担持アルミナ触
媒を用いることで、排気に含まれる窒素酸化物に対して
水素及び炭化水素を効果的に反応させられる。According to a third aspect of the present invention, the second catalyst is a platinum-supported zeolite catalyst or a silver-supported alumina catalyst. According to this configuration, by using a platinum-supported zeolite catalyst or a silver-supported alumina catalyst as the second catalyst, hydrogen and hydrocarbons can be effectively reacted with the nitrogen oxides contained in the exhaust gas.
【００１０】請求項４記載の発明では、前記第１及び第
２の触媒は、１つのモノリスに、２層状態又は混合状態
で塗布される構成であることを特徴とする。かかる構成
によれば、排気浄化装置を構成する部品点数が削減さ
れ、装置の小型化及びコスト削減等が図られる。[0010] The invention according to claim 4 is characterized in that the first and second catalysts are applied to one monolith in a two-layer state or a mixed state. According to such a configuration, the number of components constituting the exhaust gas purification device is reduced, and the size and cost of the device are reduced.
【００１１】請求項５記載の発明では、前記モノリス
は、前記第１の触媒が塗布された上流側に配置される第
１モノリスと、前記第２の触媒が塗布された下流側に配
置される第２モノリスと、から構成されることを特徴と
する。[0011] In the invention described in claim 5, the monolith is disposed on an upstream side where the first catalyst is applied, and is disposed on a downstream side where the second catalyst is applied. And a second monolith.
【００１２】かかる構成によれば、各モノリスにおける
反応が単純化され、効果的に排気浄化が行なわれる。According to this configuration, the reaction in each monolith is simplified, and the exhaust gas is effectively purified.
【００１３】[0013]
【発明の実施の形態】以下、添付された図面を参照して
本発明を詳述する。図１は、本発明に係るディーゼルエ
ンジンの排気浄化装置（以下「排気浄化装置」という）
の全体構成を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 is an exhaust gas purification device for a diesel engine according to the present invention (hereinafter referred to as “exhaust gas purification device”).
1 shows the entire configuration.
【００１４】ディーゼルエンジンの排気通路１０には、
その上流から下流にかけて、ハニカム形状の横断面を有
する第１モノリス１２と第２モノリス１４とが直列に介
装される。In the exhaust passage 10 of the diesel engine,
From the upstream to the downstream, a first monolith 12 and a second monolith 14 having a honeycomb-shaped cross section are interposed in series.
【００１５】第１モノリス１２には、次式のように、効
率的な水蒸気改質反応を起こすロジウム担持ジルコニア
触媒（Ｒｈ/ＺｒＯ2）が塗布される。 ＣmＨn＋mＨ2Ｏ→mＣＯ＋（m＋n／2）Ｈ2 一方、第２モノリス１４には、次式のように、排気に含
まれるＮＯｘに対して、第１モノリス１２に塗布された
ロジウム担持ジルコニア触媒の反応により生成された水
素（Ｈ2）、及び、還元剤としての炭化水素（ＣmＨn）
を夫々反応させて、排気を浄化する触媒が塗布される。
このような触媒としては、例えば、白金担持ゼオライト
触媒（Ｐｔ／ゼオライト）又は銀担持アルミナ触媒（Ａ
ｇ／Ａｌ 2Ｏ3）が用いられる。The first monolith 12 has an effect as shown in the following equation.
Rhodium-supported zirconia causing efficient steam reforming reaction
Catalyst (Rh / ZrOTwo) Is applied. CmHn+ MHTwoO → mCO + (m + n / 2) HTwo On the other hand, the second monolith 14 includes the
NOx was applied to the first monolith 12
Water produced by the reaction of rhodium supported zirconia catalyst
Elementary (HTwo) And hydrocarbons (CmHn)
And a catalyst for purifying the exhaust gas is applied.
As such a catalyst, for example, a platinum-supported zeolite
Catalyst (Pt / zeolite) or silver-supported alumina catalyst (A
g / Al TwoOThree) Is used.
【００１６】ＮＯx＋Ｈ2→Ｎ2＋Ｈ2Ｏ ＮＯx＋ＣmＨn→Ｎ2＋ＣＯ2＋Ｈ2Ｏ また、第１モノリス１２の上流側の排気通路１０には、
第１モノリス１２の上流側にＨＣとしての燃料を添加す
る燃料添加装置１６（炭化水素添加手段）が介装され
る。燃料添加装置１６は、排気通路１０内に燃料を噴射
する燃料噴射弁１６ａと、燃料タンク１６ｂに貯留され
た燃料を燃料噴射弁１６ａに加圧供給する燃料ポンプ１
６ｃと、燃料ポンプ１６ｃを駆動する電動モータ１６ｄ
と、電動モータ１６ｄの駆動制御を行なうコントロール
ユニット１６ｅと、を含んで構成される。コントロール
ユニット１６ｅには、機関回転速度Ｎｅを検出する回転
速度センサ１８と、機関負荷Ｌを検出する負荷センサ２
０と、の出力が夫々入力される。そして、コントロール
ユニット１６ｅでは、例えば、図２のような燃料添加量
マップが参照され、機関回転速度Ｎｅ及び機関負荷Ｌに
基づいて燃料添加量が決定され、燃料噴射弁１６ａの開
弁時間の制御を介して燃料添加量の増減制御が行なわれ
る。NO x + H 2 → N 2 + H 2 O NO x + C m H n → N 2 + CO 2 + H 2 O In the exhaust passage 10 on the upstream side of the first monolith 12,
A fuel addition device 16 (hydrocarbon addition means) for adding fuel as HC is provided upstream of the first monolith 12. The fuel adding device 16 includes a fuel injection valve 16a that injects fuel into the exhaust passage 10 and a fuel pump 1 that pressurizes and supplies the fuel stored in the fuel tank 16b to the fuel injection valve 16a.
6c and an electric motor 16d for driving the fuel pump 16c
And a control unit 16e for controlling the driving of the electric motor 16d. The control unit 16e includes a rotation speed sensor 18 for detecting the engine rotation speed Ne and a load sensor 2 for detecting the engine load L.
0 and the output of each are input. Then, in the control unit 16e, for example, a fuel addition amount map as shown in FIG. 2 is referred to, the fuel addition amount is determined based on the engine rotation speed Ne and the engine load L, and the valve opening time of the fuel injection valve 16a is controlled. The increase / decrease control of the fuel addition amount is performed via the control unit.
【００１７】なお、以上説明しなかった符号２２は、排
気通路１０に対して第１モノリス１２及び第２モノリス
１４を保持するための保持材である。次に、かかる構成
からなる排気浄化装置の作用について説明する。Reference numeral 22 not described above is a holding member for holding the first monolith 12 and the second monolith 14 in the exhaust passage 10. Next, the operation of the exhaust gas purifying apparatus having the above configuration will be described.
【００１８】ディーゼルエンジンから排出された排気
は、排気通路１０を通って排気浄化装置に導入される
と、燃料添加装置１６により添加された燃料と混合し、
排気と燃料とからなる混合気が形成される。この混合気
が第１モノリス１２を通過する際、第１モノリス１２に
塗布されたロジウム担持ジルコニア触媒と接触し、次式
のような水蒸気改質反応が起こる。When the exhaust gas discharged from the diesel engine is introduced into the exhaust gas purification device through the exhaust passage 10, it mixes with the fuel added by the fuel addition device 16,
A mixture of exhaust gas and fuel is formed. When this mixture passes through the first monolith 12, it comes into contact with the rhodium-supported zirconia catalyst applied to the first monolith 12, and a steam reforming reaction as shown in the following equation occurs.
【００１９】ＣmＨn＋mＨ2Ｏ→mＣＯ＋（m＋n／2）Ｈ2 即ち、水蒸気改質反応により、燃料と排気中に含まれる
水蒸気（Ｈ2Ｏ）とが反応し、一酸化炭素（ＣＯ）と水
素（Ｈ2）とが生成される。C m H n + mH 2 O → mCO + (m + n / 2) H 2 In other words, the fuel and the steam (H 2 O) contained in the exhaust gas react by the steam reforming reaction, and carbon monoxide (CO) ) And hydrogen (H 2 ).
【００２０】そして、混合気，一酸化炭素及び水素が第
２モノリス１４を通過する際、第２モノリス１４に塗布
された白金担持ゼオライト触媒又は銀担持アルミナ触媒
と接触し、次式のような排気浄化反応が起こる。When the air-fuel mixture, carbon monoxide and hydrogen pass through the second monolith 14, they come into contact with a platinum-supported zeolite catalyst or a silver-supported alumina catalyst applied to the second monolith 14, and an exhaust gas represented by the following formula: A purification reaction takes place.
【００２１】ＮＯx＋Ｈ2→Ｎ2＋Ｈ2Ｏ ＮＯx＋ＣmＨn→Ｎ2＋ＣＯ2＋Ｈ2Ｏ 従って、排気中に含まれるＮＯｘは、水素改質反応によ
って生成された水素、及び、燃料添加装置１６によって
添加された燃料のうち第１モノリス１２を通過した燃料
と反応し、無害な窒素，二酸化炭素及び水（水蒸気）と
なる。このため、触媒の活性化が低い低温状態であって
も、排気に含まれるＮＯｘが低減されるので、ＮＯｘの
排出量をより低減することができる。NO x + H 2 → N 2 + H 2 O NO x + C m H n → N 2 + CO 2 + H 2 O Therefore, NOx contained in the exhaust gas is composed of hydrogen produced by the hydrogen reforming reaction and fuel It reacts with the fuel that has passed through the first monolith 12 among the fuels added by the addition device 16, and becomes harmless nitrogen, carbon dioxide, and water (steam). Therefore, even in a low temperature state where the activation of the catalyst is low, the amount of NOx contained in the exhaust gas is reduced, so that the emission amount of NOx can be further reduced.
【００２２】なお、第１モノリス１２における水蒸気改
質反応により生成された一酸化炭素は、そのまま排気浄
化装置から排出されるが、その排出量は極めて微量であ
り、酸化触媒等で処理可能であるため、排気性状には影
響がない。The carbon monoxide generated by the steam reforming reaction in the first monolith 12 is directly discharged from the exhaust gas purification device, but the amount of discharge is extremely small and can be treated with an oxidation catalyst or the like. Therefore, there is no effect on the exhaust properties.
【００２３】また、以上説明した排気浄化装置は、排気
通路１０に２つのモノリス１２及び１４を直列に介装し
た構成であるが、図３（Ａ）に示すように、排気通路１
０に１つのモノリス２４を介装した構成を採用してもよ
い。この場合には、モノリス２４に、ロジウム担持ジル
コニア触媒、及び、白金担持ゼオライト触媒若しくは銀
担持アルミナ触媒を、２層状態（図３（Ｂ））又は混合
状態（図３（Ｃ））で塗布すればよい。The exhaust gas purifying apparatus described above has a structure in which two monoliths 12 and 14 are interposed in series in an exhaust passage 10, but as shown in FIG.
A configuration in which one monolith 24 is interposed in 0 may be adopted. In this case, the monolith 24 is coated with a rhodium-supported zirconia catalyst and a platinum-supported zeolite catalyst or a silver-supported alumina catalyst in a two-layer state (FIG. 3B) or a mixed state (FIG. 3C). I just need.
【００２４】なお、かかる構成の排気浄化装置の作用
は、先の実施形態における排気浄化装置と同様であるの
で、その説明は省略することとする。The operation of the exhaust gas purifying apparatus having such a configuration is the same as that of the exhaust gas purifying apparatus according to the previous embodiment, and the description thereof will be omitted.
【００２５】[0025]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、触媒の活性化が低い低温状態であっても、
排気に含まれる窒素酸化物が低減されるので、窒素酸化
物の排出量をより低減することができる。As described above, according to the first aspect of the present invention, even in a low temperature state where the activation of the catalyst is low,
Since the amount of nitrogen oxides contained in the exhaust gas is reduced, the emission amount of nitrogen oxides can be further reduced.
【００２６】請求項２記載の発明によれば、水蒸気改質
反応を効果的に行なうことができる。請求項３記載の発
明によれば、排気に含まれる窒素酸化物に対して、水素
及び炭化水素を効果的に反応させることができる。According to the second aspect of the present invention, the steam reforming reaction can be effectively performed. According to the third aspect of the invention, hydrogen and hydrocarbons can effectively react with nitrogen oxides contained in exhaust gas.
【００２７】請求項４記載の発明によれば、装置の小型
化及びコスト削減等を図ることができる。請求項５記載
の発明によれば、効果的に排気浄化を行なうことができ
る。According to the fourth aspect of the invention, it is possible to reduce the size and cost of the apparatus. According to the fifth aspect of the present invention, the exhaust gas can be effectively purified.
【図１】 ディーゼルエンジンの排気浄化装置の一例を
示す全体構成図FIG. 1 is an overall configuration diagram showing an example of an exhaust gas purification device for a diesel engine.
【図２】 燃料添加マップの説明図FIG. 2 is an explanatory diagram of a fuel addition map.
【図３】 ディーゼルエンジンの排気浄化装置の他の例
を示し、（Ａ）はモノリスの構造説明図、（Ｂ）は２層
状態で触媒を塗布した状態の説明図、（Ｃ）は混合状態
で触媒を塗布した状態の説明図3A and 3B show another example of an exhaust gas purification device for a diesel engine, in which FIG. 3A is a diagram illustrating the structure of a monolith, FIG. 3B is a diagram illustrating a state where a catalyst is applied in a two-layer state, and FIG. Illustration of the state where the catalyst is applied with
１０ 排気通路 １２ 第１モノリス １４ 第２モノリス １６ 燃料添加装置 ２４ モノリス Reference Signs List 10 exhaust passage 12 first monolith 14 second monolith 16 fuel addition device 24 monolith
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０１Ｎ 3/08 Ｆ０１Ｎ 3/10 Ａ 3/10 3/28 ３０１Ｃ 3/28 ３０１ ３０１Ｇ Ｂ０１Ｄ 53/36 １０２Ｈ Ｆターム(参考） 3G091 AA18 AB01 AB04 BA03 BA14 BA39 CA18 CB08 DA01 DA02 DB10 EA01 EA03 FA02 FA04 FB02 FC07 GA06 GB01W GB01X GB05W GB06W GB06X GB09X GB10X HA08 HA47 4D048 AA06 AB02 AC02 BA03X BA08X BA11X BA30X BA33X BA34X BA41X BB02 CC32 CC36 CC46 CC50 4G040 EA03 EA06 EC03 4G069 AA03 AA11 BA01A BA05A BA07A BB04A BC32A BC71A BC75A CA03 CA08 CA13 EC28 EE05 EE09 FB23 ZA00──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F01N 3/08 F01N 3/10 A 3/10 3/28 301C 3/28 301 301G B01D 53/36 102H F Terms (reference) 3G091 AA18 AB01 AB04 BA03 BA14 BA39 CA18 CB08 DA01 DA02 DB10 EA01 EA03 FA02 FA04 FB02 FC07 GA06 GB01W GB01X GB05W GB06W GB06X GB09X GB10X HA08 HA47 4D048 AA06 AB02 AC02 BA03X BA08X BA11X BA30 CCX3 EA06 EC03 4G069 AA03 AA11 BA01A BA05A BA07A BB04A BC32A BC71A BC75A CA03 CA08 CA13 EC28 EE05 EE09 FB23 ZA00
Claims (5)
加手段と、 を含んで構成されるディーゼルエンジンの排気浄化装置
であって、 前記第１の触媒は、前記炭化水素添加手段により添加さ
れた炭化水素を還元剤として、次式のような水蒸気改質
反応を起こさせる一方、 ＣmＨn＋mＨ2Ｏ→mＣＯ＋（m＋n／2）Ｈ2 前記第２の触媒は、排気中の窒素酸化物に対して、前記
第１の触媒により生成された水素及び前記炭化水素添加
手段により添加された炭化水素を、夫々次式のように反
応させる ＮＯx＋Ｈ2→Ｎ2＋Ｈ2Ｏ ＮＯx＋ＣmＨn→Ｎ2＋ＣＯ2＋Ｈ2Ｏ ことを特徴とするディーゼルエンジンの排気浄化装置。1. A monolith interposed in an exhaust passage, first and second catalysts applied to the monolith, and hydrocarbon adding means for adding hydrocarbon to an upstream side of the monolith. An exhaust gas purification apparatus for a diesel engine, wherein the first catalyst causes a hydrocarbon added by the hydrocarbon adding means as a reducing agent to cause a steam reforming reaction as shown in the following equation. C m H n + mH 2 O → mCO + (m + n / 2) H 2 wherein the second catalyst is to the nitrogen oxides in the exhaust, by the first hydrogen and the hydrocarbon adding means generated by the catalyst An exhaust gas purifying apparatus for a diesel engine, characterized by reacting the added hydrocarbons as follows: NO x + H 2 → N 2 + H 2 O NO x + C m H n → N 2 + CO 2 + H 2 O .
ア触媒であることを特徴とする請求項１記載のディーゼ
ルエンジンの排気浄化装置。2. The exhaust gas purifying apparatus for a diesel engine according to claim 1, wherein said first catalyst is a rhodium-supported zirconia catalyst.
媒又は銀担持アルミナ触媒であることを特徴とする請求
項１又は請求項２に記載のディーゼルエンジンの排気浄
化装置。3. The diesel engine exhaust purification apparatus according to claim 1, wherein the second catalyst is a platinum-supported zeolite catalyst or a silver-supported alumina catalyst.
スに、２層状態又は混合状態で塗布される構成であるこ
とを特徴とする請求項１〜請求項３のいずれか１つに記
載のディーゼルエンジンの排気浄化装置。4. The method according to claim 1, wherein the first and second catalysts are applied to one monolith in a two-layer state or a mixed state. The exhaust gas purifying apparatus for a diesel engine according to Claim 1.
ノリスと、 前記第２の触媒が塗布された下流側に配置される第２モ
ノリスと、 から構成されることを特徴とする請求項１〜請求項３の
いずれか１つに記載のディーゼルエンジンの排気浄化装
置。5. The monolith, comprising: a first monolith disposed on the upstream side on which the first catalyst is applied; and a second monolith disposed on the downstream side on which the second catalyst is applied. The exhaust gas purification device for a diesel engine according to any one of claims 1 to 3, wherein the device is configured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000148019A JP2001327838A (en) | 2000-05-19 | 2000-05-19 | Exhaust cleaning device for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000148019A JP2001327838A (en) | 2000-05-19 | 2000-05-19 | Exhaust cleaning device for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001327838A true JP2001327838A (en) | 2001-11-27 |
Family
ID=18654118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000148019A Pending JP2001327838A (en) | 2000-05-19 | 2000-05-19 | Exhaust cleaning device for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001327838A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1445017A1 (en) * | 2003-02-07 | 2004-08-11 | Renault s.a.s. | Precious metal based catalyst and its use for treating exhaust gas |
| CN100355488C (en) * | 2003-05-07 | 2007-12-19 | 韩国高化环保技术有限公司 | Catalytic process for nitrogen oxides reduction by multi-injection and use thereof |
| JP2008018374A (en) * | 2006-07-14 | 2008-01-31 | Honda Motor Co Ltd | Catalyst and apparatus for cleaning exhaust gas |
| WO2009060822A1 (en) * | 2007-11-08 | 2009-05-14 | Honda Motor Co., Ltd. | Exhaust cleaner for internal combustion engine and method of exhaust purification |
| WO2019033687A1 (en) * | 2017-08-14 | 2019-02-21 | 张达积 | Automobile and diesel exhaust-gas infrared steam reformer |
-
2000
- 2000-05-19 JP JP2000148019A patent/JP2001327838A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1445017A1 (en) * | 2003-02-07 | 2004-08-11 | Renault s.a.s. | Precious metal based catalyst and its use for treating exhaust gas |
| FR2850881A1 (en) * | 2003-02-07 | 2004-08-13 | Renault Sa | PRECIOUS METAL CATALYST AND USES THEREOF IN THE TREATMENT OF EXHAUST GASES |
| CN100355488C (en) * | 2003-05-07 | 2007-12-19 | 韩国高化环保技术有限公司 | Catalytic process for nitrogen oxides reduction by multi-injection and use thereof |
| JP2008018374A (en) * | 2006-07-14 | 2008-01-31 | Honda Motor Co Ltd | Catalyst and apparatus for cleaning exhaust gas |
| WO2009060822A1 (en) * | 2007-11-08 | 2009-05-14 | Honda Motor Co., Ltd. | Exhaust cleaner for internal combustion engine and method of exhaust purification |
| JP2009112967A (en) * | 2007-11-08 | 2009-05-28 | Honda Motor Co Ltd | Apparatus and method for cleaning exhaust gas of internal combustion engine |
| WO2019033687A1 (en) * | 2017-08-14 | 2019-02-21 | 张达积 | Automobile and diesel exhaust-gas infrared steam reformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2034149A1 (en) | Exhaust gas purifying apparatus and exhaust gas purifying method using the same | |
| JP2010506088A (en) | System and method for reducing nitrogen oxide emissions | |
| JPWO2005103461A1 (en) | Exhaust gas purification device for internal combustion engine | |
| CN102137718A (en) | Exhaust gas purifying catalyst and method for producing the same | |
| JP2009165904A (en) | Exhaust gas purifier | |
| JP4370238B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JP2001170454A (en) | Exhaust gas cleaning system and exhaust gas cleaning catalyst | |
| JP2003269142A (en) | Exhaust emission control method and device | |
| EP1536111B1 (en) | Apparatus and method for removal of by-products from exhaust gases of a combustion engine | |
| JP2001327838A (en) | Exhaust cleaning device for diesel engine | |
| JP2011033001A (en) | Exhaust emission control device | |
| JPH10118457A (en) | Exhaust gas cleaning apparatus for internal combustion engine | |
| US20090151340A1 (en) | Exhaust gas purification device | |
| JP5094199B2 (en) | Exhaust gas purification device | |
| JP4946725B2 (en) | Exhaust gas purification method and exhaust gas purification device | |
| JP2001025645A (en) | Exhaust gas cleaning system | |
| JP2007332885A (en) | Nox purification system and nox purification method | |
| JP2003290629A (en) | Cleaning system for exhaust gas | |
| JP2002317625A (en) | Exhaust emission control device for lean-burn engine | |
| JP3905359B2 (en) | Exhaust gas purification device for gas engine | |
| JP2001000840A (en) | Exhaust gas purifying device | |
| JP4326723B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JPH05171921A (en) | Exhaust gas purifying device | |
| JP4006613B2 (en) | Apparatus for measuring hydrogen content in exhaust gas and exhaust gas purification system | |
| JP2001140630A (en) | Exhaust emission control device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050329 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20071210 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080108 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20080507 |